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RF Cafe Quiz #4

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All RF Cafe quizzes would make perfect fodder for employment interviews for technicians or engineers - particularly those who are fresh out of school or are relatively new to the work world. Come to think of it, they would make equally excellent study material for the same persons who are going to be interviewed for a job.

Some of these books used in quizzes are available as prizes in the monthly RF Cafe Giveaway.

Note: Many answers contain passages quoted in whole or in part from the text.




1. Which of the following can cause frequency
    intermodulation products in a system?
a) Only semiconductor junctions like diodes and
    transistors (amplifiers)
b) Cable connectors, bolted or riveted antenna
    panels, isolators and circulators
c) Both a) and b)



2. What is the melting temperature of standard
    60/40, tin/lead solder?
a) 100°C (212°F)
b) 250°C (482°F)
c) 186°C (386°F)



3. What is the frequency band for the 900 MHz
    GSM cellular band?
a) Tx: 880-915 MHz / Rx: 925-960 MHz
b) Tx: 824-849 MHz / Rx: 869-894 MHz
c) There is no 900 MHz GSM band



4. What does GSM stand for?
a) General System for Mobile phones
b) Greater Spectrum for Mobile phones
c) Global System for Mobile Communication



5. What does POTS stand for (in communications)?
a) Plain Old Telephone System
b) PersOnal Telephony System
c) Personal Orbital & Terrestrial  Satellite



6. Which of these pairs of materials in the triboelectric series have the greatest charge transfer potential?
a) Silk & Wool
b) Rubber Balloon & Celluloid
c) Glass & Hard Rubber



7. Along which side of rectangular waveguide is an "E" bend made?
a) Longer side
b) Shorter side
c) "E"ither side



8. What is the lowest modulation index at which an FM carrier is suppressed?
a) 2.40
b) π (3.1416)
c) Only AM carriers can be suppressed



9. How much current is required through the human body to cause an onset to muscular paralysis during electrocution?
a) Voltage is the culprit during electrocution, not current
b) 21 mA
c) ½ amp



10. At what frequency is electromagnetic energy maximally absorbed due to oxygen in the atmosphere?
a) 22 GHz
b) Only water in the atmosphere absorbs electromagnetic energy
c) 63 GHz

Need some help? Click here for the answers and explanations.

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